>>272
Ok, here's another example: https://github.com/marcoheisig/ucons/, specifically https://github.com/marcoheisig/ucons/blob/master/code/readtable.lisp
The parser was extended to integrate the unique cons system, adding dynamically syntactic sugar.
You can go on, the point is that new syntax can be created in the language itself, in a portable way, when needed. Maybe only for a few lines, or for the entire file. Whatever you need, the future is open.
Now please focus on the concept of reader macros, and don't start whining about "Well I don't need unique conses! That's stupid, and so is Lisp!!!1!".